# std::mutex::mutex

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< cpp‎ | thread‎ | mutex

constexpr mutex() noexcept; | (1) | (since C++11)
mutex( const mutex& ) = delete; | (2) | (since C++11)

1) Constructs the mutex. The mutex is in unlocked state after the constructor completes.
2) Copy constructor is deleted.

### Parameters

(none)

### Notes

Because the default constructor is constexpr, static mutexes are initialized as part of static non-local initialization, before any dynamic non-local initialization begins. This makes it safe to lock a mutex in a constructor of any static object.

### See also

C documentation for mtx_init

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